A broadband power signal adaptive measurement method, system, device and medium

Abstract

This application provides a broadband power signal adaptive measurement method, system, device, and medium. The method includes: power signal acquisition, acquiring power signals from a power system, performing basic measurement processing on the power signals to obtain basic measurement parameters, including amplitude parameters, power frequency parameters, and waveform characteristic parameters; adaptive switching of measurement modes, determining the operating state of the power signals based on the basic measurement parameters, and controlling the switching of measurement modes according to the operating state, the measurement modes including basic measurement mode and broadband measurement mode; broadband measurement and analysis, when the measurement mode is broadband measurement mode, performing broadband measurement on the power signals to obtain broadband power signals, using a broadband analysis window as the basic analysis unit to perform broadband disturbance detection on the broadband power signals, and obtaining broadband disturbance detection results; broadband measurement convergence, based on the broadband disturbance detection results, controlling the measurement mode to maintain the broadband measurement mode or switch to the basic measurement mode.

Description

Technical Field

[0001] This application relates to the field of power measurement technology, and in particular to a broadband power signal adaptive measurement method, system, device and medium. Background Technology

[0002] With the continuous expansion of the power system and the high proportion of new energy power generation connected to the grid, the operating characteristics of the power system are gradually evolving towards power electronics. Under the combined effects of factors such as new energy grid connection, widespread application of power electronic devices, and increasingly complex load structures, in addition to the traditional 50Hz power frequency signal, the power system may also generate non-power frequency components such as subsynchronous oscillation, supersynchronous oscillation, and mid-frequency broadband oscillation, posing new challenges to the safe and stable operation of the power system.

[0003] Existing power system measurement devices, such as measurement and control devices and phasor measurement units, primarily focus on measuring and analyzing power frequency signals. Their measurement modes and algorithms are typically designed for steady-state or quasi-steady-state operating scenarios, making it difficult to continuously and effectively monitor broadband disturbances occurring in power systems. During power system operation, if traditional basic measurement modes are still used when broadband disturbances occur, it is often difficult to identify relevant abnormal characteristics in a timely manner, thus affecting the accurate assessment of the operating status.

[0004] To adapt to changes in the operating characteristics of power systems, researchers have gradually proposed introducing broadband measurement techniques to achieve unified measurement and analysis of multi-frequency power signals. However, broadband measurement techniques still face practical constraints in engineering applications. On the one hand, to cover a wider frequency range, it is usually necessary to increase the signal sampling rate, which leads to a significant increase in the amount of sampled data, resulting in increased computational burden, decreased real-time performance, and increased system resource consumption. On the other hand, when the power system is in steady-state operation for most of the time, continuous broadband measurement and analysis can easily cause unnecessary consumption of computational resources and reduce the engineering efficiency of the measurement device.

[0005] Therefore, there is an urgent need for a broadband adaptive measurement method, system, equipment, and medium for power signals. Summary of the Invention

[0006] This application provides a broadband power signal adaptive measurement method, system, device, and medium to solve the problems of the prior art.

[0007] In a first aspect, this application provides a broadband power signal adaptive measurement method, comprising:

[0008] Power signal acquisition involves acquiring power signals from a power system and performing basic measurement processing on the power signals to obtain basic measurement parameters, including amplitude parameters, power frequency parameters, and waveform characteristic parameters.

[0009] The measurement mode adaptively switches, and based on the basic measurement parameters, the operating status of the power signal is determined, and the switching of the measurement mode is controlled according to the operating status. The measurement mode includes a basic measurement mode and a wideband measurement mode.

[0010] Wideband measurement and analysis: When the measurement mode is wideband measurement mode, wideband measurement is performed on the power signal to obtain the wideband power signal, and wideband disturbance detection is performed on the wideband power signal using the wideband analysis window as the basic analysis unit to obtain the wideband disturbance detection result;

[0011] Broadband measurement convergence: Based on the broadband disturbance detection results, control the measurement mode to maintain the broadband measurement mode or switch to the basic measurement mode.

[0012] In one possible design, the measurement mode adaptively switches, including:

[0013] Based on the amplitude parameter, power frequency parameter and waveform characteristic parameter in the basic measurement parameters, the amplitude state, frequency state and waveform state of the power signal are determined respectively, and the operating state of the power signal is determined according to the amplitude state, frequency state and waveform state, the operating state includes steady-state operating state and non-steady-state operating state.

[0014] For the aforementioned operating state, bidirectional switching control is performed between the basic measurement mode and the broadband measurement mode.

[0015] In one possible design, determining the operating state of the power signal based on the amplitude state, frequency state, and waveform state includes:

[0016] When the amplitude state, frequency state, and waveform state are all normal, the operating state of the power signal is determined to be a steady-state operating state.

[0017] Otherwise, the operating state of the power signal is determined to be an unsteady operating state.

[0018] In one possible design, the broadband measurement and analysis includes:

[0019] In the wideband measurement mode, the power signal is sampled wideband to obtain a wideband power signal;

[0020] Determine the broadband analysis window corresponding to the broadband analysis, and segment the broadband power signal to form broadband segmented data;

[0021] Broadband analysis is performed on each of the broadband segmented data to extract broadband feature parameters related to disturbance identification. The broadband feature parameters include voltage broadband feature parameters and current broadband feature parameters.

[0022] Using the broadband analysis window as the basic analysis unit for broadband disturbance detection, broadband disturbance detection is performed based on the broadband characteristic parameters to determine whether broadband power signals have broadband disturbances and obtain broadband disturbance detection results.

[0023] In one possible design, the basic measurement mode is used to acquire basic measurement parameters of the power system, and the broadband measurement mode is used to acquire broadband power signals containing broadband disturbances.

[0024] The switching of measurement modes is controlled according to the operating status, including:

[0025] When the operating state is a steady-state operating state and the current measurement mode is a wideband measurement mode, control the measurement mode to switch to the basic measurement mode;

[0026] When the operating state is a non-steady-state operating state and the current measurement mode is the basic measurement mode, control the measurement mode to switch to the wideband measurement mode;

[0027] Otherwise, maintain the current measurement mode.

[0028] In one possible design, the broadband disturbance detection includes disturbance detection based on bandwidth energy characteristics, disturbance detection based on dominant frequency band characteristics, and disturbance detection based on spectral variation characteristics.

[0029] Within the same broadband analysis window, when the disturbance detection result based on the frequency band energy characteristics is normal, the disturbance detection result based on the dominant frequency band characteristics is normal, and the disturbance detection result based on the spectrum change characteristics is normal, it is determined that the broadband disturbance detection result is that there is no broadband disturbance.

[0030] Otherwise, the broadband disturbance detection result is determined to indicate the presence of broadband disturbance.

[0031] In one possible design, based on the broadband disturbance detection results, the control measurement mode is either maintained in broadband measurement mode or switched to basic measurement mode, including:

[0032] If the broadband disturbance detection results are all positive within M consecutive broadband analysis windows, the measurement mode is maintained as broadband measurement mode.

[0033] When the broadband disturbance detection results are all negative within M consecutive broadband analysis windows, the measurement mode is switched from broadband measurement mode to basic measurement mode.

[0034] Where M is a positive integer.

[0035] Secondly, this application provides a broadband power signal adaptive measurement system, comprising:

[0036] The power signal acquisition module acquires power signals from the power system and performs basic measurement processing on the power signals to obtain basic measurement parameters, including amplitude parameters, power frequency parameters, and waveform characteristic parameters.

[0037] The measurement mode adaptive switching module determines the operating status of the power signal based on the basic measurement parameters and controls the switching of the measurement mode according to the operating status. The measurement modes include the basic measurement mode and the broadband measurement mode.

[0038] The wideband measurement and analysis module, when the measurement mode is wideband measurement mode, performs wideband measurement on the power signal to obtain the wideband power signal, and uses the wideband analysis window as the basic analysis unit to perform wideband disturbance detection on the wideband power signal to obtain the wideband disturbance detection result;

[0039] The broadband measurement convergence module controls the measurement mode to maintain the broadband measurement mode or switch to the basic measurement mode based on the broadband disturbance detection results.

[0040] Thirdly, this application provides an electronic device, comprising:

[0041] Processor; and,

[0042] Memory for storing the executable instructions of the processor;

[0043] The processor is configured to perform any of the possible methods described in the first aspect by executing the executable instructions.

[0044] Fourthly, this application provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement any of the possible methods described in the first aspect.

[0045] Compared with the prior art, this application has the following beneficial effects:

[0046] This application provides a broadband power signal adaptive measurement method, system, device, and medium. The method performs basic measurement processing on the power signal and determines its operating status. It then adaptively switches between a basic measurement mode and a broadband measurement mode. In the broadband measurement mode, it performs broadband disturbance detection based on a broadband analysis window. Simultaneously, it combines the broadband disturbance detection results to perform convergence control on the measurement mode. This satisfies the broadband disturbance detection requirements while avoiding the resource consumption caused by prolonged broadband measurement mode, thus improving the resource utilization efficiency in the power measurement process. It is suitable for online monitoring of power systems under complex operating conditions.

[0047] Furthermore, this application comprehensively determines the operating status of power signals based on amplitude, frequency, and waveform states, and further introduces a broadband disturbance detection mechanism based on frequency band energy characteristics, dominant frequency band characteristics, and spectral change characteristics. This mechanism enables multi-dimensional identification of broadband disturbances in power signals at a broadband analysis window scale. Simultaneously, the detection results from a continuous broadband analysis window are used to maintain or switch measurement modes, improving the stability and reliability of broadband disturbance determination and reducing the risk of frequent mode switching due to misjudgment.

[0048] Furthermore, the broadband power signal adaptive measurement system provided in this application, through the coordinated configuration of various functional modules, realizes power signal acquisition, adaptive switching of measurement modes, broadband measurement and analysis, and measurement mode convergence control, enabling the system to automatically adjust the measurement mode according to the operating status of the power signal and the broadband disturbance detection results, thereby improving the overall flexibility and stability of the system operation. Attached Figure Description

[0049] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0050] Figure 1 This is a flowchart illustrating a broadband power signal adaptive measurement method according to an example embodiment of this application;

[0051] Figure 2 This is a schematic diagram of the measurement mode adaptive switching process shown in an example embodiment of this application;

[0052] Figure 3 This is a schematic flowchart illustrating broadband measurement and analysis according to an example embodiment of this application;

[0053] Figure 4 This is a schematic diagram of the structure of a broadband power signal adaptive measurement system according to an example embodiment of this application;

[0054] Figure 5This is a schematic diagram of the structure of an electronic device according to an example embodiment of this application.

[0055] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0056] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0057] This embodiment proposes a broadband power signal adaptive measurement method, system, device, and medium, which is applicable to measurement scenarios where broadband disturbances may exist in addition to power frequency signals during power system operation. It is especially suitable for application environments where the power system has a high degree of power electronics and complex operating characteristics.

[0058] This embodiment dynamically selects the measurement mode based on the operating status of the power system, and achieves reasonable switching between basic measurement and broadband measurement. This satisfies the broadband disturbance detection requirements while reducing unnecessary broadband measurement resource occupation and improving resource utilization efficiency in the power measurement process.

[0059] Figure 1 This is a schematic flowchart illustrating a broadband power signal adaptive measurement method according to an example embodiment of this application. Figure 1 As shown, the broadband power signal adaptive measurement method provided in this embodiment includes:

[0060] Step S101: Power signal acquisition. Acquire power signals from the power system and perform basic measurement processing on the power signals to obtain basic measurement parameters, including amplitude parameters, power frequency parameters, and waveform characteristic parameters.

[0061] In this step, voltage sampling signal U(t) and current sampling signal I(t) in the power system are first acquired by voltage and current sensors installed at the measurement points of the power system.

[0062] It should be noted that the voltage sensor and current sensor can be voltage transformers, current transformers or equivalent acquisition devices commonly used in the existing power measurement field, and this embodiment does not limit them.

[0063] Subsequently, basic measurement processing is performed on the acquired voltage sampling signal U(t) and current sampling signal I(t) to extract basic measurement parameters from the power signals. This basic measurement processing is implemented using existing power measurement and signal processing methods.

[0064] Basic measurement parameters include:

[0065] Amplitude parameters, including the effective values ​​of voltage and current, are used to characterize the amplitude level of power signals;

[0066] Power frequency parameters, including the power frequency of the power signal, are used to characterize the frequency state of the power signal;

[0067] Waveform characteristic parameters include voltage waveform characteristic parameters and current waveform characteristic parameters. The voltage waveform characteristic parameter is the average value calculated from the continuously sampled voltage signal U(t) within a preset time statistical interval; the current waveform characteristic parameter is the average value calculated from the continuously sampled current signal I(t) within a preset time statistical interval. These voltage and current waveform characteristic parameters are used to characterize the short-time waveform variation features of the power signal.

[0068] The time statistics interval is used to limit the time range for statistical calculation of voltage and current sampling signals. Its length is preset according to the update cycle of basic measurement parameters, system response speed or noise immunity requirements, in order to balance measurement stability and response sensitivity. This embodiment does not make specific limitations on this.

[0069] The aforementioned basic measurement parameters are directly calculated from the acquired voltage sampling signal U(t) and current sampling signal I(t), used to characterize the current operating state of the power signal, and serve as input parameters for subsequent operating state determination and adaptive switching of measurement modes.

[0070] Step S102: Adaptive switching of measurement modes. Based on the basic measurement parameters, the operating status of the power signal is determined, and the switching of measurement modes is controlled according to the operating status. The measurement modes include basic measurement mode and wideband measurement mode.

[0071] In this step, by analyzing the amplitude parameter, power frequency parameter, and waveform characteristic parameter in the basic measurement parameters, the amplitude state, frequency state, and waveform state of the power signal are determined respectively. Based on the amplitude state, frequency state, and waveform state, the operating state of the power signal is comprehensively determined, thereby realizing adaptive switching control between the basic measurement mode and the broadband measurement mode.

[0072] This step, without introducing broadband measurement, uses basic measurement parameters to quickly determine the operating status of the power signal, realizing pre-screening and adaptive switching of measurement modes. This ensures that broadband measurement is only triggered when the power signal exhibits non-steady-state operating characteristics, thereby reducing the amount of data and computational burden caused by the system being in broadband measurement mode for a long time, and improving the overall operating efficiency and stability of the measurement system.

[0073] Step S103: Wideband Measurement and Analysis. When the measurement mode is wideband measurement mode, wideband measurement is performed on the power signal to obtain the wideband power signal. The wideband analysis window is used as the basic analysis unit to perform wideband disturbance detection on the wideband power signal and obtain the wideband disturbance detection result.

[0074] In this step, the broadband power signal is segmented, and broadband feature parameters related to disturbance identification are extracted within each broadband analysis window. Based on the broadband feature parameters, it is determined whether there is broadband disturbance in the broadband power signal, providing a basis for subsequent measurement mode convergence control.

[0075] This step uses a wideband analysis window as the basic analysis unit to process wideband power signals. This ensures the time resolution of wideband disturbance detection while avoiding excessive computational complexity caused by performing overall analysis of wideband data across the entire time domain. Furthermore, by using a disturbance detection method based on wideband characteristic parameters, it achieves effective identification of wideband disturbances in power signals, providing reliable detection results to support the dynamic adjustment of measurement modes.

[0076] Step S104: Wideband measurement convergence. Based on the wideband disturbance detection results, control the measurement mode to maintain the wideband measurement mode or switch to the basic measurement mode.

[0077] In this step, based on the broadband disturbance detection results, the measurement mode is controlled to maintain the broadband measurement mode or switch to the basic measurement mode, including:

[0078] When the broadband disturbance detection results are all positive within M consecutive broadband analysis windows, the measurement mode is maintained as broadband measurement mode, and broadband measurement and broadband disturbance detection are continuously performed on the power signal.

[0079] When the broadband disturbance detection results are all negative within M consecutive broadband analysis windows, the control measurement mode is switched from broadband measurement mode to basic measurement mode, where M is a positive integer.

[0080] It should be noted that after switching the measurement mode to the basic measurement mode, the power signal is reprocessed to obtain basic measurement parameters, and the operating status of the power signal is determined based on the basic measurement parameters to determine whether it is necessary to switch back to the broadband measurement mode.

[0081] This step enables adaptive connection between the broadband measurement process and the basic measurement process, ensuring the continuity of disturbance detection while avoiding unnecessary broadband measurement resource consumption, thereby achieving continuous and stable online monitoring of the power system.

[0082] Figure 2 This is a schematic diagram illustrating the adaptive switching of measurement modes according to an example embodiment of this application. Figure 2 As shown, the measurement mode adaptive switching method provided in this embodiment includes:

[0083] Step S1021: Based on the amplitude parameter, power frequency parameter and waveform characteristic parameter in the basic measurement parameters, determine the amplitude state, frequency state and waveform state of the power signal respectively, and determine the operating state of the power signal according to the amplitude state, frequency state and waveform state. The operating state includes steady-state operating state and non-steady-state operating state.

[0084] In this step, the amplitude state, frequency state, and waveform state of the power signal are determined based on the amplitude parameter, power frequency parameter, and waveform characteristic parameters in the basic measurement parameters, including:

[0085] The amplitude state of the power signal is determined based on the amplitude parameters, specifically:

[0086] The effective voltage value is compared with the preset voltage reference range, and the effective current value is compared with the preset current reference range.

[0087] When the effective voltage value is within the voltage reference range and the effective current value is within the current reference range, the amplitude state of the power signal is determined to be normal.

[0088] Otherwise, the amplitude of the power signal is determined to be abnormal.

[0089] The frequency state of the power signal is determined based on the aforementioned power frequency parameters, specifically:

[0090] Compare the power frequency parameters with the preset power frequency reference range;

[0091] When the power frequency parameter is within the power frequency reference range, the frequency state of the power signal is determined to be normal.

[0092] Otherwise, the frequency state of the power signal is determined to be an abnormal change;

[0093] The waveform state of the power signal is determined based on the aforementioned waveform characteristic parameters, specifically:

[0094] The voltage waveform characteristic parameters are compared with the preset voltage waveform threshold, and the current waveform characteristic parameters are compared with the preset current waveform threshold.

[0095] When the voltage waveform characteristic parameter is less than the voltage waveform threshold and the current waveform characteristic parameter is less than the current waveform threshold, the waveform state of the power signal is determined to be normal.

[0096] Otherwise, the waveform state of the power signal is determined to be abnormal.

[0097] It should be noted that the preset voltage reference range, current reference range, power frequency reference range, voltage waveform threshold and current waveform threshold can be obtained based on historical measurement data under normal power system operation, or preset according to the rated operating parameters and allowable fluctuation range of the equipment under test, or determined through controlled testing or on-site calibration. This embodiment does not make specific limitations on these.

[0098] Determining the operating status of the power signal based on the amplitude status, frequency status, and waveform status includes:

[0099] When the amplitude state, frequency state, and waveform state are all normal, the operating state of the power signal is determined to be a steady-state operating state.

[0100] Otherwise, the operating state of the power signal is determined to be an unsteady operating state.

[0101] Step S1022: For the operating state, perform bidirectional switching control between the basic measurement mode and the broadband measurement mode.

[0102] In this step, the basic measurement mode is used to acquire the basic measurement parameters of the power system, including amplitude parameters, power frequency parameters, and waveform characteristic parameters. These basic measurement parameters represent the routine operating information of the power system. The broadband measurement mode is used to acquire broadband power signals that include broadband disturbances.

[0103] The switching of measurement modes is controlled according to the operating status, including:

[0104] When the operating state is a steady-state operating state and the current measurement mode is a wideband measurement mode, control the measurement mode to switch to the basic measurement mode;

[0105] When the operating state is a non-steady-state operating state and the current measurement mode is the basic measurement mode, control the measurement mode to switch to the wideband measurement mode;

[0106] Otherwise, maintain the current measurement mode.

[0107] Figure 3This is a schematic flowchart illustrating broadband measurement and analysis according to an example embodiment of this application. Figure 3 As shown, the broadband measurement and analysis provided in this embodiment includes:

[0108] Step S1031: In the wideband measurement mode, the power signal is sampled wideband to obtain a wideband power signal.

[0109] In this step, after the control measurement mode is switched to wideband measurement mode, the sampling methods of the voltage sampling signal U(t) and the current sampling signal I(t) in the power signal are adjusted to perform wideband sampling. Specifically:

[0110] In wideband measurement mode, set the wideband sampling rate F. WB Among them, the wideband sampling rate F WB The base sampling rate F is higher than that of the base measurement mode. B This is to cover the target frequency range required for broadband analysis.

[0111] At wideband sampling rate F WB The voltage sampling signal U(t) and the current sampling signal I(t) are continuously sampled to obtain the corresponding wideband voltage sampling signal U. WB (t) and wideband current sampling signal I WB (t), wideband voltage sampling signal U WB (t) and wideband current sampling signal I WB (t) together constitute a broadband power signal.

[0112] It should be noted that wideband sampling can be achieved through existing technologies such as increasing the sampling frequency of the analog-to-digital converter, adjusting the sampling clock, or switching to a wideband sampling channel. This embodiment does not impose specific limitations on this.

[0113] This step enables wideband sampling of power signals while maintaining the continuity of the measurement link, providing a high-temporal-resolution raw data foundation for subsequent wideband analysis and wideband disturbance detection.

[0114] Step S1032: Determine the broadband analysis window corresponding to the broadband analysis, and segment the broadband power signal to form broadband segmented data.

[0115] In this step, based on the acquired wideband voltage sampling signal U WB (t) Forming a wideband voltage sequence U WB Based on wideband current sampling signal I WB (t) Forming a broadband current sequence I WB Wideband voltage sequences and wideband current sequences together constitute wideband power signal sequences.

[0116] Determine the broadband analysis window T for broadband analysis WB The broadband analysis window is used to limit the time range corresponding to broadband analysis processing.

[0117] Based on wideband sampling rate F WB and wideband analysis window T WB Determine the number N of sampling points within each broadband analysis window. WB ,in:

[0118]

[0119] Among them, F WB For wideband sampling rate; T WB This is the wideband analysis window.

[0120] According to the number of sampling points N WB The broadband power signal sequence is segmented, that is, the continuous broadband sampling points in the broadband power signal sequence are divided into multiple broadband segment data, and each broadband segment data corresponds to a broadband analysis window.

[0121] It should be noted that the wideband analysis window T WB The length is preset or dynamically adjusted according to the duration characteristics of the broadband disturbance, the computing power of the terminal device, or the target frequency band resolution requirements. This embodiment does not impose specific limitations on this.

[0122] This step converts a continuous broadband power signal sequence into broadband segmented data suitable for broadband analysis and processing, providing a unified data processing unit for subsequent broadband feature parameter extraction and broadband disturbance detection.

[0123] Step S1033: Perform broadband analysis on each broadband segment of data to extract broadband feature parameters related to disturbance identification. The broadband feature parameters include voltage broadband feature parameters and current broadband feature parameters.

[0124] In this step, broadband analysis is performed on each broadband data segment to obtain broadband characteristic parameters, including voltage broadband characteristic parameters and current broadband characteristic parameters. Specifically:

[0125] Based on the wideband voltage sequence, wideband voltage feature parameters are extracted. These wideband voltage feature parameters include voltage frequency band energy distribution feature parameters, voltage dominant frequency band feature parameters, and voltage spectrum variation feature parameters.

[0126] Broadband current characteristic parameters are extracted based on broadband current sequences. These parameters include current band energy distribution characteristics, current dominant frequency band characteristics, and current spectrum variation characteristics. Among them:

[0127] Voltage frequency band energy distribution characteristic parameters and current frequency band energy distribution characteristic parameters are used to characterize the energy distribution or energy ratio changes of different frequency bands within a wideband analysis window;

[0128] Voltage-dominant frequency band characteristic parameters and current-dominant frequency band characteristic parameters are used to characterize the frequency band range with the highest energy proportion or the frequency band range with concentrated energy distribution within a wideband analysis window;

[0129] Voltage spectrum variation characteristic parameters and current spectrum variation characteristic parameters are used to characterize the changes in spectral shape or energy distribution between adjacent broadband analysis windows.

[0130] It should be noted that broadband analysis can be implemented using fast Fourier transform, short-time Fourier transform, filter bank analysis, or other existing broadband signal analysis methods. This embodiment does not impose any specific limitations on this method.

[0131] This step converts the broadband segmented data into broadband feature parameters for subsequent broadband disturbance detection, enabling effective extraction of disturbance-related features from broadband power signals.

[0132] Step S1034: Using the broadband analysis window as the basic analysis unit for broadband disturbance detection, broadband disturbance detection is performed based on the broadband characteristic parameters to determine whether broadband power signal has broadband disturbance and obtain broadband disturbance detection results.

[0133] In this step, for the corresponding broadband segment data within each broadband analysis window, broadband disturbance detection is performed based on broadband voltage and current characteristic parameters to determine whether broadband disturbances exist in the broadband power signal within that broadband analysis window. Broadband disturbance detection includes disturbance detection based on band energy characteristics, disturbance detection based on dominant frequency band characteristics, and disturbance detection based on spectral variation characteristics. Specifically:

[0134] Perturbation detection based on frequency band energy characteristics includes:

[0135] Pre-set voltage energy reference thresholds for voltage frequency band energy distribution characteristic parameters and current energy reference thresholds for current frequency band energy distribution characteristic parameters;

[0136] The voltage frequency band energy distribution characteristic parameters are compared with the corresponding voltage energy reference thresholds, and the current frequency band energy distribution characteristic parameters are compared with the corresponding current energy reference thresholds.

[0137] When the voltage frequency band energy distribution characteristic parameter is less than or equal to the voltage energy reference threshold, and the current frequency band energy distribution characteristic parameter is less than or equal to the current energy reference threshold, the disturbance detection result based on the frequency band energy characteristics is judged to be normal.

[0138] Otherwise, the disturbance detection result based on frequency band energy characteristics is determined to indicate the presence of a disturbance.

[0139] Disturbance detection based on dominant frequency band characteristics includes:

[0140] Pre-set voltage frequency band characteristic reference ranges for voltage-dominant frequency band characteristic parameters, and set current frequency band characteristic reference ranges for current-dominant frequency band characteristic parameters;

[0141] The characteristic parameters of the voltage-dominant frequency band are compared with the corresponding voltage frequency band characteristic reference intervals, and the characteristic parameters of the current-dominant frequency band are compared with the corresponding current frequency band characteristic reference intervals.

[0142] When the voltage-dominant frequency band characteristic parameters are within the voltage frequency band characteristic reference range, and the current-dominant frequency band characteristic parameters are within the current frequency band characteristic reference range, the detection result based on the dominant frequency band characteristic disturbance detection is determined to be normal.

[0143] Otherwise, the detection result based on the dominant frequency band feature disturbance detection is determined to indicate the presence of a disturbance.

[0144] Perturbation detection based on spectral variation characteristics includes:

[0145] Pre-set a reference threshold for voltage spectrum variation characteristic parameters and a reference threshold for current spectrum variation characteristic parameters;

[0146] The voltage spectrum change characteristic parameters are compared with the corresponding voltage spectrum change reference thresholds, and the current spectrum change characteristic parameters are compared with the corresponding current spectrum change reference thresholds.

[0147] When the voltage spectrum change characteristic parameter is less than or equal to the voltage spectrum change reference threshold, and the current spectrum change characteristic parameter is less than or equal to the current spectrum change reference threshold, the disturbance detection result based on the spectrum change characteristics is determined to be normal.

[0148] Otherwise, the disturbance detection result based on spectral change characteristics is determined to indicate the presence of a disturbance.

[0149] Within the same broadband analysis window, if the disturbance detection result based on the frequency band energy characteristics is normal, the disturbance detection result based on the dominant frequency band characteristics is normal, and the disturbance detection result based on the spectrum change characteristics is normal, then the broadband disturbance detection result is determined to be that there is no broadband disturbance.

[0150] Otherwise, the broadband disturbance detection result is determined to indicate the presence of broadband disturbance.

[0151] It should be noted that the voltage energy reference threshold, current energy reference threshold, voltage frequency band characteristic reference range, current frequency band characteristic reference range, voltage spectrum change reference threshold, and current spectrum change reference threshold can be obtained based on historical broadband data statistics under normal power system operation, or preset according to the rated operating parameters and allowable fluctuation range of the equipment under test, or determined through controlled testing or on-site calibration. This embodiment does not impose specific limitations on these aspects.

[0152] In this embodiment, a wideband analysis window is used as the basic analysis unit for wideband disturbance detection. Multi-dimensional disturbance detection based on frequency band energy characteristics, dominant frequency band characteristics and spectral change characteristics is performed on the corresponding wideband segment data within each wideband analysis window to determine whether wideband disturbance exists, thereby achieving highly sensitive identification of wideband disturbance.

[0153] This method can quickly capture broadband abnormal signals in the power system caused by power electronic equipment, new energy grid connection or load changes under limited computing resources, improve the real-time performance and reliability of broadband disturbance detection, and provide accurate front-end criteria for subsequent operation analysis or control processing.

[0154] Figure 4 This is a schematic diagram illustrating the structure of a broadband power signal adaptive measurement system according to an example embodiment of this application. Figure 4 As shown, the broadband power signal adaptive measurement system 400 provided in this embodiment includes: a power signal acquisition module 410, a measurement mode adaptive switching module 420, a broadband measurement and analysis module 430, and a broadband measurement convergence module 440.

[0155] The power signal acquisition module 410 acquires power signals from the power system and performs basic measurement processing on the power signals to obtain basic measurement parameters, including amplitude parameters, power frequency parameters, and waveform characteristic parameters.

[0156] The measurement mode adaptive switching module 420 determines the operating status of the power signal based on the basic measurement parameters and controls the switching of the measurement mode according to the operating status. The measurement modes include a basic measurement mode and a wideband measurement mode.

[0157] The broadband measurement and analysis module 430, when the measurement mode is broadband measurement mode, performs broadband measurement on the power signal to obtain the broadband power signal, and uses the broadband analysis window as the basic analysis unit to perform broadband disturbance detection on the broadband power signal to obtain the broadband disturbance detection result;

[0158] The broadband measurement convergence module 440 controls the measurement mode to maintain the broadband measurement mode or switch to the basic measurement mode based on the broadband disturbance detection result.

[0159] Figure 5 This is a schematic diagram of the structure of an electronic device according to an example embodiment of this application. For example... Figure 5 As shown, the electronic device 500 provided in this embodiment includes: a processor 501 and a memory 502; wherein:

[0160] Memory 502 is used to store computer programs, and the memory may also be flash memory.

[0161] Processor 501 is used to execute the execution instructions stored in the memory to implement the various steps in the above method. For details, please refer to the relevant descriptions in the preceding method embodiments.

[0162] Alternatively, the memory 502 can be either standalone or integrated with the processor 501.

[0163] When the memory 502 is a device independent of the processor 501, the electronic device 500 may further include:

[0164] Bus 503 is used to connect the memory 502 and the processor 501.

[0165] This embodiment also provides a readable storage medium storing a computer program, which, when executed by at least one processor of an electronic device, enables the electronic device to perform the methods provided in the various embodiments described above.

[0166] This embodiment also provides a program product including a computer program stored in a readable storage medium. At least one processor of an electronic device can read the computer program from the readable storage medium, and the at least one processor executes the computer program to cause the electronic device to perform the methods provided in the various embodiments described above.

[0167] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the foregoing claims.

[0168] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope.

Claims

1. A broadband power signal adaptive measurement method, characterized in that, include: Power signal acquisition involves acquiring power signals from a power system and performing basic measurement processing on the power signals to obtain basic measurement parameters, including amplitude parameters, power frequency parameters, and waveform characteristic parameters. The measurement mode adaptively switches, and based on the basic measurement parameters, the operating status of the power signal is determined, and the switching of the measurement mode is controlled according to the operating status. The measurement mode includes a basic measurement mode and a wideband measurement mode. Wideband measurement and analysis: When the measurement mode is wideband measurement mode, wideband measurement is performed on the power signal to obtain the wideband power signal, and wideband disturbance detection is performed on the wideband power signal using the wideband analysis window as the basic analysis unit to obtain the wideband disturbance detection result; Broadband measurement convergence: Based on the broadband disturbance detection results, control the measurement mode to maintain the broadband measurement mode or switch to the basic measurement mode.

2. The broadband power signal adaptive measurement method according to claim 1, characterized in that, The adaptive switching of the measurement mode includes: Based on the amplitude parameter, power frequency parameter and waveform characteristic parameter in the basic measurement parameters, the amplitude state, frequency state and waveform state of the power signal are determined respectively, and the operating state of the power signal is determined according to the amplitude state, frequency state and waveform state, the operating state includes steady-state operating state and non-steady-state operating state. For the aforementioned operating state, bidirectional switching control is performed between the basic measurement mode and the broadband measurement mode.

3. The broadband power signal adaptive measurement method according to claim 2, characterized in that, Determining the operating status of the power signal based on the amplitude status, frequency status, and waveform status includes: When the amplitude state, frequency state, and waveform state are all normal, the operating state of the power signal is determined to be a steady-state operating state. Otherwise, the operating state of the power signal is determined to be an unsteady operating state.

4. The broadband power signal adaptive measurement method according to claim 1, characterized in that, The broadband measurement and analysis includes: In the wideband measurement mode, the power signal is sampled wideband to obtain a wideband power signal; Determine the broadband analysis window corresponding to the broadband analysis, and segment the broadband power signal to form broadband segmented data; Broadband analysis is performed on each of the broadband segmented data to extract broadband feature parameters related to disturbance identification. The broadband feature parameters include voltage broadband feature parameters and current broadband feature parameters. Using the broadband analysis window as the basic analysis unit for broadband disturbance detection, broadband disturbance detection is performed based on the broadband characteristic parameters to determine whether broadband power signals have broadband disturbances and obtain broadband disturbance detection results.

5. The broadband power signal adaptive measurement method according to claim 1, characterized in that, The basic measurement mode is used to obtain the basic measurement parameters of the power system, and the broadband measurement mode is used to obtain the broadband power signal containing broadband disturbances. The switching of measurement modes is controlled according to the operating status, including: When the operating state is a steady-state operating state and the current measurement mode is a wideband measurement mode, control the measurement mode to switch to the basic measurement mode; When the operating state is a non-steady-state operating state and the current measurement mode is the basic measurement mode, control the measurement mode to switch to the wideband measurement mode; Otherwise, maintain the current measurement mode.

6. The broadband power signal adaptive measurement method according to claim 1, characterized in that, The broadband disturbance detection includes disturbance detection based on bandwidth energy characteristics, disturbance detection based on dominant frequency band characteristics, and disturbance detection based on spectral variation characteristics; Within the same broadband analysis window, when the disturbance detection result based on the frequency band energy characteristics is normal, the disturbance detection result based on the dominant frequency band characteristics is normal, and the disturbance detection result based on the spectrum change characteristics is normal, it is determined that the broadband disturbance detection result is that there is no broadband disturbance. Otherwise, the broadband disturbance detection result is determined to indicate the presence of broadband disturbance.

7. The broadband power signal adaptive measurement method according to claim 1, characterized in that, Based on the broadband disturbance detection results, the control measurement mode is maintained in broadband measurement mode or switched to basic measurement mode, including: If the broadband disturbance detection results are all positive within M consecutive broadband analysis windows, the measurement mode is maintained as broadband measurement mode. When the broadband disturbance detection results are all negative within M consecutive broadband analysis windows, the measurement mode is switched from broadband measurement mode to basic measurement mode. Where M is a positive integer.

8. A broadband power signal adaptive measurement system, characterized in that, include: The power signal acquisition module acquires power signals from the power system and performs basic measurement processing on the power signals to obtain basic measurement parameters, including amplitude parameters, power frequency parameters, and waveform characteristic parameters. The measurement mode adaptive switching module determines the operating status of the power signal based on the basic measurement parameters and controls the switching of the measurement mode according to the operating status. The measurement modes include the basic measurement mode and the broadband measurement mode. The wideband measurement and analysis module, when the measurement mode is wideband measurement mode, performs wideband measurement on the power signal to obtain the wideband power signal, and uses the wideband analysis window as the basic analysis unit to perform wideband disturbance detection on the wideband power signal to obtain the wideband disturbance detection result; The broadband measurement convergence module controls the measurement mode to maintain the broadband measurement mode or switch to the basic measurement mode based on the broadband disturbance detection results.

9. An electronic device, characterized in that, include: processor; as well as, Memory for storing the executable instructions of the processor; The processor is configured to execute the method of any one of claims 1 to 7 by executing the executable instructions.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any one of claims 1 to 7.

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